package cn.site.core.orm.persistence;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.domain.Sort.Order;

import com.fasterxml.jackson.annotation.JsonIgnore;

import cn.site.core.config.Global;
import cn.site.core.utils.CookieUtils;

/**
 * 分页类
 * <p/>
 * Created by ZGJ on 2015/3/3.
 */
public class Page<T> {
    private int pageNo = 1; // 当前页码
    private int pageSize = Integer.valueOf(Global.getConfig("page.pageSize")); // 页面大小，设置为“-1”表示不进行分页（分页无效）
    private long count; // 总记录数，设置为“-1”表示不查询总数
    private int first; // 首页索引
    private int last; // 尾页索引
    private int prev; // 上一页索引
    private int next; // 下一页索引
    private boolean firstPage; // 是否是第一页
    private boolean lastPage; // 是否是最后一页
    private int length = 8; // 显示页面长度
    private int slider = 1; // 前后显示页面长度
    private List<T> list = new ArrayList<T>();
    private String orderBy = ""; // 标准查询有效， 实例： updatedate desc, name asc
    private String funcName = "page"; // 设置点击页码调用的js函数名称，默认为page，在一页有多个分页对象时使用。
    private String message = ""; // 设置提示消息，显示在“共n条”之后

    public Page() {
        this.pageSize = -1;
    }

    /**
     * 构造方法
     *
     * @param request  传递 repage 参数，来记住页码
     * @param response 用于设置 Cookie，记住页码
     */
    public Page(HttpServletRequest request, HttpServletResponse response) {
        this(request, response, -2);
    }

    /**
     * 构造方法
     *
     * @param request         传递 repage 参数，来记住页码
     * @param response        用于设置 Cookie，记住页码
     * @param defaultPageSize 默认分页大小，如果传递 -1 则为不分页，返回所有数据
     */
    public Page(HttpServletRequest request, HttpServletResponse response,
                int defaultPageSize) {
        // 设置页码参数（传递repage参数，来记住页码）
        String no = request.getParameter("pageNo");
        if (StringUtils.isNumeric(no)) {
            CookieUtils.setCookie(response, "pageNo", no);
            this.setPageNo(Integer.parseInt(no));
        } else if (request.getParameter("repage") != null) {
            no = CookieUtils.getCookie(request, "pageNo");
            if (StringUtils.isNumeric(no)) {
                this.setPageNo(Integer.parseInt(no));
            }
        }
        // 设置页面大小参数（传递repage参数，来记住页码大小）
        String size = request.getParameter("pageSize");
        if (StringUtils.isNumeric(size)) {
            CookieUtils.setCookie(response, "pageSize", size);
            this.setPageSize(Integer.parseInt(size));
        } else if (request.getParameter("repage") != null) {
            no = CookieUtils.getCookie(request, "pageSize");
            if (StringUtils.isNumeric(size)) {
                this.setPageSize(Integer.parseInt(size));
            }
        } else if (defaultPageSize != -2) {
            this.pageSize = defaultPageSize;
        }
        // 设置排序参数
        String orderBy = request.getParameter("orderBy");
        if (StringUtils.isNotBlank(orderBy)) {
            this.setOrderBy(orderBy);
        }
    }

    /**
     * 构造方法
     *
     * @param pageNo   当前页码
     * @param pageSize 分页大小
     */
    public Page(int pageNo, int pageSize) {
        this(pageNo, pageSize, 0);
    }

    /**
     * 构造方法
     *
     * @param pageNo   当前页码
     * @param pageSize 分页大小
     * @param count    数据条数
     */
    public Page(int pageNo, int pageSize, long count) {
        this(pageNo, pageSize, count, new ArrayList<T>());
    }

    /**
     * 构造方法
     *
     * @param pageNo   当前页码
     * @param pageSize 分页大小
     * @param count    数据条数
     * @param list     本页数据对象列表
     */
    public Page(int pageNo, int pageSize, long count, List<T> list) {
        this.setCount(count);
        this.setPageNo(pageNo);
        this.pageSize = pageSize;
        this.setList(list);
    }

    /**
     * 初始化参数
     */
    public void initialize() {
        // 1
        this.first = 1;

        this.last = (int) (count / (this.pageSize < 1 ? 20 : this.pageSize)
                + first - 1);

        if (this.count % this.pageSize != 0 || this.last == 0) {
            this.last++;
        }

        if (this.last < this.first) {
            this.last = this.first;
        }

        if (this.pageNo <= 1) {
            this.pageNo = this.first;
            this.firstPage = true;
        }

        if (this.pageNo >= this.last) {
            this.pageNo = this.last;
            this.lastPage = true;
        }

        if (this.pageNo < this.last - 1) {
            this.next = this.pageNo + 1;
        } else {
            this.next = this.last;
        }

        if (this.pageNo > 1) {
            this.prev = this.pageNo - 1;
        } else {
            this.prev = this.first;
        }

        // 2
        if (this.pageNo < this.first) {// 如果当前页小于首页
            this.pageNo = this.first;
        }

        if (this.pageNo > this.last) {// 如果当前页大于尾页
            this.pageNo = this.last;
        }
    }

    /**
     * 默认输出当前分页标签 <div class="page">${page}</div>
     */
    @Override
    public String toString() {

        initialize();

        StringBuilder sb = new StringBuilder();

        if (pageNo == first) {// 如果是首页
            sb.append("<li class=\"disabled\"><a href=\"javascript:\">&#171; 上一页</a></li>\n");
        } else {
            sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "("
                    + prev + "," + pageSize + ");\">&#171; 上一页</a></li>\n");
        }
        // 根据设定的分页信息显示长度设置开始位置
        int begin = pageNo - (length / 2);
        // 当开始位置小于1时，就让开始位置从1开始
        if (begin < first) {
            begin = first;
        }
        // 结束位置
        int end = begin + length - 1;
        // 如果结束位置大于最后一页就让结束位置等于最后一页
        if (end >= last) {
            end = last;
            // 再获取开始位置
            begin = end - length + 1;
            // 开始位置小于1时，就设定为1
            if (begin < first) {
                begin = first;
            }
        }
        // 当开始位置不是第一页时
        if (begin > first) {
            int i = 0;
            // 设置分页信息的页码
            for (i = first; i < first + slider && i < begin; i++) {
                sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName
                        + "(" + i + "," + pageSize + ");\">" + (i + 1 - first)
                        + "</a></li>\n");
            }
            if (i < begin) {
                sb.append("<li class=\"disabled\"><a href=\"javascript:\">...</a></li>\n");
            }
        }

        for (int i = begin; i <= end; i++) {
            if (i == pageNo) {
                sb.append("<li class=\"active\"><a href=\"javascript:\">"
                        + (i + 1 - first) + "</a></li>\n");
            } else {
                sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName
                        + "(" + i + "," + pageSize + ");\">" + (i + 1 - first)
                        + "</a></li>\n");
            }
        }

        if (last - end > slider) {
            sb.append("<li class=\"disabled\"><a href=\"javascript:\">...</a></li>\n");
            end = last - slider;
        }

        for (int i = end + 1; i <= last; i++) {
            sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "("
                    + i + "," + pageSize + ");\">" + (i + 1 - first)
                    + "</a></li>\n");
        }

        if (pageNo == last) {
            sb.append("<li class=\"disabled\"><a href=\"javascript:\">下一页 &#187;</a></li>\n");
        } else {
            sb.append("<li><a href=\"javascript:\" onclick=\"" + funcName + "("
                    + next + "," + pageSize + ");\">" + "下一页 &#187;</a></li>\n");
        }

        sb.append("<li class=\"disabled controls\"><a href=\"javascript:\">当前 ");
        sb.append("<input type=\"text\" value=\""
                + pageNo
                + "\" onkeypress=\"var e=window.event||this;var c=e.keyCode||e.which;if(c==13)");
        sb.append(funcName + "(this.value," + pageSize
                + ");\" onclick=\"this.select();\"/> / ");
        sb.append("<input type=\"text\" value=\""
                + pageSize
                + "\" onkeypress=\"var e=window.event||this;var c=e.keyCode||e.which;if(c==13)");
        sb.append(funcName + "(" + pageNo
                + ",this.value);\" onclick=\"this.select();\"/> 条，");
        sb.append("共 " + count + " 条" + (message != null ? message : "")
                + "</a><li>\n");

        sb.insert(0, "<ul>\n").append("</ul>\n");

        sb.append("<div style=\"clear:both;\"></div>");

        // sb.insert(0,"<div class=\"page\">\n").append("</div>\n");

        return sb.toString();
    }

    /**
     * 获取分页HTML代码
     *
     * @return
     */
    public String getHtml() {
        return toString();
    }

    public int getPageNo() {
        return pageNo;
    }

    public void setPageNo(int pageNo) {
        this.pageNo = pageNo;
    }

    public int getPageSize() {
        return pageSize;
    }

    /**
     * 设置页面大小（最大500）
     *
     * @param pageSize
     */
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize <= 0 ? 10 : pageSize;// > 500 ? 500 : pageSize;
    }

    public long getCount() {
        return count;
    }

    /**
     * 设置数据总数
     *
     * @param count
     */
    public void setCount(long count) {
        this.count = count;
        if (pageSize >= count) {
            pageNo = 1;
        }
    }

    /**
     * 首页索引
     *
     * @return
     */
    @JsonIgnore
    public int getFirst() {
        return first;
    }

    public void setFirst(int first) {
        this.first = first;
    }

    /**
     * 尾页索引
     *
     * @return
     */
    @JsonIgnore
    public int getLast() {
        return last;
    }

    /**
     * 获取页面总数
     *
     * @return getLast();
     */
    @JsonIgnore
    public int getTotalPage() {
        return getLast();
    }

    public void setLast(int last) {
        this.last = last;
    }

    /**
     * 上一页索引值
     *
     * @return
     */
    @JsonIgnore
    public int getPrev() {
        return prev;
    }

    public void setPrev(int prev) {
        this.prev = prev;
    }

    /**
     * 下一页索引值
     *
     * @return
     */
    @JsonIgnore
    public int getNext() {
        return next;
    }

    public void setNext(int next) {
        this.next = next;
    }

    /**
     * 是否为第一页
     *
     * @return
     */
    @JsonIgnore
    public boolean isFirstPage() {
        return firstPage;
    }

    public void setFirstPage(boolean firstPage) {
        this.firstPage = firstPage;
    }

    /**
     * 是否为最后一页
     *
     * @return
     */
    @JsonIgnore
    public boolean isLastPage() {
        return lastPage;
    }

    public void setLastPage(boolean lastPage) {
        this.lastPage = lastPage;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getSlider() {
        return slider;
    }

    public void setSlider(int slider) {
        this.slider = slider;
    }

    public List<T> getList() {
        return list;
    }

    /**
     * 设置本页数据对象列表
     *
     * @param list
     */
    public Page<T> setList(List<T> list) {
        this.list = list;
        return this;
    }

    /**
     * 获取查询排序字符串
     *
     * @return
     */
    @JsonIgnore
    public String getOrderBy() {
        return orderBy;
    }

    public void setOrderBy(String orderBy) {
        this.orderBy = orderBy;
    }

    /**
     * 获取点击页码调用的js函数名称 function ${page.funcName}(pageNo){location=
     * "${ctx}/list-${category.id}${urlSuffix}?pageNo="+i;}
     *
     * @return
     */
    @JsonIgnore
    public String getFuncName() {
        return funcName;
    }

    /**
     * 设置点击页码调用的js函数名称，默认为page，在一页有多个分页对象时使用。
     *
     * @param funcName 默认为page
     */
    public void setFuncName(String funcName) {
        this.funcName = funcName;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    /**
     * 分页是否有效
     *
     * @return this.pageSize==-1
     */
    @JsonIgnore
    public boolean isDisabled() {
        return this.pageSize == -1;
    }

    /**
     * 是否进行总数统计
     *
     * @return this.count==-1
     */
    @JsonIgnore
    public boolean isNotCount() {
        return this.count == -1;
    }

    /**
     * 获取 Hibernate FirstResult
     */
    public int getFirstResult() {
        int firstResult = (getPageNo() - 1) * getPageSize();
        if (firstResult >= getCount()) {
            firstResult = 0;
        }
        return firstResult;
    }

    public int getLastResult() {
        int lastResult = getFirstResult() + getMaxResults();
        if (lastResult > getCount()) {
            lastResult = (int) getCount();
        }
        return lastResult;
    }

    /**
     * 获取 Hibernate MaxResults
     */
    public int getMaxResults() {
        return getPageSize();
    }

    public Pageable getSpringPage() {
        List<Order> orders = new ArrayList<Order>();
        if (this.orderBy != null) {
            for (String order : StringUtils.split(this.orderBy, ",")) {
                String[] o = StringUtils.split(order, " ");
                if (o.length == 1)
                    orders.add(new Sort.Order(Sort.Direction.ASC, o[0]));
                else if (o.length == 2) {
                    if ("DESC".equals(o[1].toUpperCase()))
                        orders.add(new Sort.Order(Sort.Direction.DESC, o[0]));
                    else {
                        orders.add(new Sort.Order(Sort.Direction.ASC, o[0]));
                    }
                }
            }
        }
        return new PageRequest(this.pageNo - 1, this.pageSize, new Sort(orders));
    }

    public void setSpringPage(org.springframework.data.domain.Page<T> page) {
        this.pageNo = page.getNumber();
        this.pageSize = page.getSize();
        this.count = page.getTotalElements();
        this.list = page.getContent();
    }


    public static void main(String[] args) throws Exception {
//		Page<String> p = new Page<String>(3, 3);
//		System.out.println(p);
//		System.out.println("首页："+p.getFirst());
//		System.out.println("尾页："+p.getLast());
//		System.out.println("上页："+p.getPrev());
//		System.out.println("下页："+p.getNext());

    }
}
